Exodus 16:23

16:23 He said to them, “This is what the Lord has said: ‘Tomorrow is a time of cessation from work, a holy Sabbath to the Lord. Whatever you want to bake, bake today; whatever you want to boil, boil today; whatever is left put aside for yourselves to be kept until morning.’”

Exodus 16:27-28

16:27 On the seventh day some of the people went out to gather it, but they found nothing. 16:28 So the Lord said to Moses, “How long do you refuse to obey my commandments and my instructions?